Waste sludge disintegration and bound water reduction by chemical oxidation: A comparative study

Authors : Hanife SARI ERKAN

Pages : 118-131

View : 27 | Download : 8

Publication Date : 2022-03-25

Article Type : Research Paper

Abstract :Waste sludge disintegration and bound water reduction was investigated by comparative chemical oxidation using calcium hypochlorite, hydrogen peroxide, peroxymonusulfate and peroxydisulfate in the study. Response surface methodology insert ignore into journalissuearticles values(RSM); with Box-Benhken Design insert ignore into journalissuearticles values(BBD); was used to determine operating parameters namely initial pH insert ignore into journalissuearticles values(2-10);, oxidant dosage insert ignore into journalissuearticles values(5-85 mg/g TSS);, and Fe2+ to oxidant ratio; 0.2-2); and disintegration time insert ignore into journalissuearticles values(20-100 min);. According to ANOVA results, determination coefficient insert ignore into journalissuearticles values(R2); was found 93.2%, 76.3%, 84% and 84.8% for each oxidant, respectively. Under the optimum operating conditions, disintegration degree in terms of chemical oxygen demand insert ignore into journalissuearticles values(DDCOD); was calculated 11.09%, 5.23%, 10.75%, and 5.34%, respectively. Furthermore, bound water reduction insert ignore into journalissuearticles values(BWR); of waste sludge increased after the disintegration process, and 33.52%, 24.56%, 44.63% and 32.80% BWR values were obtained under the same operating conditions. Results show that the higher DDCOD and BWR values were achieved by calcium hypochlorite and peroxymonosulfate treatment.
Keywords : Waste sludge, Disintegration, Bound water, Hyrogen peroxide, Hypochlorite, Persulfate

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